432 lines
10 KiB
C
432 lines
10 KiB
C
/*
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* Hisilicon thermal sensor driver
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*
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* Copyright (c) 2014-2015 Hisilicon Limited.
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* Copyright (c) 2014-2015 Linaro Limited.
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*
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* Xinwei Kong <kong.kongxinwei@hisilicon.com>
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* Leo Yan <leo.yan@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include "thermal_core.h"
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#define TEMP0_TH (0x4)
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#define TEMP0_RST_TH (0x8)
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#define TEMP0_CFG (0xC)
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#define TEMP0_EN (0x10)
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#define TEMP0_INT_EN (0x14)
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#define TEMP0_INT_CLR (0x18)
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#define TEMP0_RST_MSK (0x1C)
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#define TEMP0_VALUE (0x28)
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#define HISI_TEMP_BASE (-60)
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#define HISI_TEMP_RESET (100000)
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#define HISI_MAX_SENSORS 4
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struct hisi_thermal_sensor {
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struct hisi_thermal_data *thermal;
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struct thermal_zone_device *tzd;
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long sensor_temp;
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uint32_t id;
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uint32_t thres_temp;
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};
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struct hisi_thermal_data {
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struct mutex thermal_lock; /* protects register data */
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struct platform_device *pdev;
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struct clk *clk;
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struct hisi_thermal_sensor sensors[HISI_MAX_SENSORS];
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int irq, irq_bind_sensor;
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bool irq_enabled;
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void __iomem *regs;
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};
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/* in millicelsius */
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static inline int _step_to_temp(int step)
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{
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/*
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* Every step equals (1 * 200) / 255 celsius, and finally
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* need convert to millicelsius.
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*/
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return (HISI_TEMP_BASE * 1000 + (step * 200000 / 255));
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}
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static inline long _temp_to_step(long temp)
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{
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return ((temp - HISI_TEMP_BASE * 1000) * 255) / 200000;
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}
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static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
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struct hisi_thermal_sensor *sensor)
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{
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long val;
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mutex_lock(&data->thermal_lock);
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/* disable interrupt */
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writel(0x0, data->regs + TEMP0_INT_EN);
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writel(0x1, data->regs + TEMP0_INT_CLR);
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/* disable module firstly */
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writel(0x0, data->regs + TEMP0_EN);
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/* select sensor id */
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writel((sensor->id << 12), data->regs + TEMP0_CFG);
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/* enable module */
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writel(0x1, data->regs + TEMP0_EN);
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usleep_range(3000, 5000);
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val = readl(data->regs + TEMP0_VALUE);
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val = _step_to_temp(val);
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mutex_unlock(&data->thermal_lock);
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return val;
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}
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static void hisi_thermal_enable_bind_irq_sensor
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(struct hisi_thermal_data *data)
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{
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struct hisi_thermal_sensor *sensor;
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mutex_lock(&data->thermal_lock);
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sensor = &data->sensors[data->irq_bind_sensor];
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/* setting the hdak time */
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writel(0x0, data->regs + TEMP0_CFG);
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/* disable module firstly */
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writel(0x0, data->regs + TEMP0_RST_MSK);
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writel(0x0, data->regs + TEMP0_EN);
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/* select sensor id */
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writel((sensor->id << 12), data->regs + TEMP0_CFG);
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/* enable for interrupt */
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writel(_temp_to_step(sensor->thres_temp) | 0x0FFFFFF00,
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data->regs + TEMP0_TH);
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writel(_temp_to_step(HISI_TEMP_RESET), data->regs + TEMP0_RST_TH);
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/* enable module */
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writel(0x1, data->regs + TEMP0_RST_MSK);
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writel(0x1, data->regs + TEMP0_EN);
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writel(0x0, data->regs + TEMP0_INT_CLR);
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writel(0x1, data->regs + TEMP0_INT_EN);
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usleep_range(3000, 5000);
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mutex_unlock(&data->thermal_lock);
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}
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static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
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{
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mutex_lock(&data->thermal_lock);
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/* disable sensor module */
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writel(0x0, data->regs + TEMP0_INT_EN);
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writel(0x0, data->regs + TEMP0_RST_MSK);
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writel(0x0, data->regs + TEMP0_EN);
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mutex_unlock(&data->thermal_lock);
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}
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static int hisi_thermal_get_temp(void *_sensor, int *temp)
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{
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struct hisi_thermal_sensor *sensor = _sensor;
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struct hisi_thermal_data *data = sensor->thermal;
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int sensor_id = -1, i;
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long max_temp = 0;
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*temp = hisi_thermal_get_sensor_temp(data, sensor);
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sensor->sensor_temp = *temp;
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for (i = 0; i < HISI_MAX_SENSORS; i++) {
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if (!data->sensors[i].tzd)
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continue;
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if (data->sensors[i].sensor_temp >= max_temp) {
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max_temp = data->sensors[i].sensor_temp;
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sensor_id = i;
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}
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}
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/* If no sensor has been enabled, then skip to enable irq */
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if (sensor_id == -1)
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return 0;
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mutex_lock(&data->thermal_lock);
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data->irq_bind_sensor = sensor_id;
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mutex_unlock(&data->thermal_lock);
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dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, thres=%d\n",
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sensor->id, data->irq_enabled, *temp, sensor->thres_temp);
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/*
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* Bind irq to sensor for two cases:
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* Reenable alarm IRQ if temperature below threshold;
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* if irq has been enabled, always set it;
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*/
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if (data->irq_enabled) {
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hisi_thermal_enable_bind_irq_sensor(data);
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return 0;
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}
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if (max_temp < sensor->thres_temp) {
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data->irq_enabled = true;
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hisi_thermal_enable_bind_irq_sensor(data);
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enable_irq(data->irq);
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}
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return 0;
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}
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static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
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.get_temp = hisi_thermal_get_temp,
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};
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static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev)
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{
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struct hisi_thermal_data *data = dev;
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disable_irq_nosync(irq);
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data->irq_enabled = false;
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return IRQ_WAKE_THREAD;
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}
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static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
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{
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struct hisi_thermal_data *data = dev;
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struct hisi_thermal_sensor *sensor;
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int i;
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mutex_lock(&data->thermal_lock);
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sensor = &data->sensors[data->irq_bind_sensor];
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dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n",
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sensor->thres_temp / 1000);
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mutex_unlock(&data->thermal_lock);
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for (i = 0; i < HISI_MAX_SENSORS; i++) {
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if (!data->sensors[i].tzd)
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continue;
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thermal_zone_device_update(data->sensors[i].tzd,
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THERMAL_EVENT_UNSPECIFIED);
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}
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return IRQ_HANDLED;
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}
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static int hisi_thermal_register_sensor(struct platform_device *pdev,
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struct hisi_thermal_data *data,
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struct hisi_thermal_sensor *sensor,
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int index)
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{
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int ret, i;
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const struct thermal_trip *trip;
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sensor->id = index;
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sensor->thermal = data;
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sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
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sensor->id, sensor, &hisi_of_thermal_ops);
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if (IS_ERR(sensor->tzd)) {
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ret = PTR_ERR(sensor->tzd);
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sensor->tzd = NULL;
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dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
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sensor->id, ret);
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return ret;
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}
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trip = of_thermal_get_trip_points(sensor->tzd);
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for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
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if (trip[i].type == THERMAL_TRIP_PASSIVE) {
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sensor->thres_temp = trip[i].temperature;
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break;
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}
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}
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return 0;
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}
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static const struct of_device_id of_hisi_thermal_match[] = {
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{ .compatible = "hisilicon,tsensor" },
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{ /* end */ }
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};
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MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
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static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
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bool on)
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{
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struct thermal_zone_device *tzd = sensor->tzd;
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tzd->ops->set_mode(tzd,
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on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
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}
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static int hisi_thermal_probe(struct platform_device *pdev)
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{
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struct hisi_thermal_data *data;
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struct resource *res;
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int i;
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int ret;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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mutex_init(&data->thermal_lock);
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data->pdev = pdev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(data->regs)) {
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dev_err(&pdev->dev, "failed to get io address\n");
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return PTR_ERR(data->regs);
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}
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data->irq = platform_get_irq(pdev, 0);
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if (data->irq < 0)
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return data->irq;
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ret = devm_request_threaded_irq(&pdev->dev, data->irq,
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hisi_thermal_alarm_irq,
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hisi_thermal_alarm_irq_thread,
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0, "hisi_thermal", data);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, data);
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data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
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if (IS_ERR(data->clk)) {
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ret = PTR_ERR(data->clk);
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"failed to get thermal clk: %d\n", ret);
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return ret;
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}
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/* enable clock for thermal */
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ret = clk_prepare_enable(data->clk);
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if (ret) {
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dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
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return ret;
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}
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hisi_thermal_enable_bind_irq_sensor(data);
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irq_get_irqchip_state(data->irq, IRQCHIP_STATE_MASKED,
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&data->irq_enabled);
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for (i = 0; i < HISI_MAX_SENSORS; ++i) {
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ret = hisi_thermal_register_sensor(pdev, data,
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&data->sensors[i], i);
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if (ret)
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dev_err(&pdev->dev,
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"failed to register thermal sensor: %d\n", ret);
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else
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hisi_thermal_toggle_sensor(&data->sensors[i], true);
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}
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return 0;
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}
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static int hisi_thermal_remove(struct platform_device *pdev)
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{
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struct hisi_thermal_data *data = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < HISI_MAX_SENSORS; i++) {
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struct hisi_thermal_sensor *sensor = &data->sensors[i];
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if (!sensor->tzd)
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continue;
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hisi_thermal_toggle_sensor(sensor, false);
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}
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hisi_thermal_disable_sensor(data);
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clk_disable_unprepare(data->clk);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int hisi_thermal_suspend(struct device *dev)
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{
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struct hisi_thermal_data *data = dev_get_drvdata(dev);
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hisi_thermal_disable_sensor(data);
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data->irq_enabled = false;
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clk_disable_unprepare(data->clk);
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return 0;
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}
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static int hisi_thermal_resume(struct device *dev)
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{
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struct hisi_thermal_data *data = dev_get_drvdata(dev);
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int ret;
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ret = clk_prepare_enable(data->clk);
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if (ret)
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return ret;
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data->irq_enabled = true;
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hisi_thermal_enable_bind_irq_sensor(data);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
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hisi_thermal_suspend, hisi_thermal_resume);
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static struct platform_driver hisi_thermal_driver = {
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.driver = {
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.name = "hisi_thermal",
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.pm = &hisi_thermal_pm_ops,
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.of_match_table = of_hisi_thermal_match,
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},
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.probe = hisi_thermal_probe,
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.remove = hisi_thermal_remove,
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};
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module_platform_driver(hisi_thermal_driver);
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MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
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MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
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MODULE_DESCRIPTION("Hisilicon thermal driver");
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MODULE_LICENSE("GPL v2");
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